Puzzle #166 Solution: Date Puzzle 2 Spoiler Inside: Solution to Puzzle SelectShow> Let the first year digit (from the left) be Y1, the second Y2, etc. and similarly for month and day. It can not be in 20?? as M1 must be 1, and M2 has no possible value. It can not be in 199? as Y2=Y3. It can be in 198?. Y4=7. M1 must be 0. M2=6. D1=2. D2=5. The date is 1987-06-25.